a population of / populations of

Senior Member

a) The USA, the UK, Japan, Germany, and France have a population of over 50 million and a per-capital income of over USD 30,000.
b) The USA, the UK, Japan, Germany, and France have populations of over 50 million and per-capital incomes of over USD 30,000.

If b) is correct, will it not cause a misunderstanding that a total of all the people of such countries are over 50 million?